Pot type burner and means for delivering secondary air thereto



June 13, 1944. i J. L. BREESE 7 2,351,186

POT TYPE BURNER AND MEANS FOR DELIVERING SECONDARY AIR THERETO FiledJuly 11', 1941 I0 I)? yeizzar 3 3 Jkme .Z. firees'e 3 l E v y M M IPatented June I3, 1944 v 2,351,186 Po'l TYPE BURNER AND MEANS FOR DELIV-ERING SECONDARY AIR rrmrm'ro James L. Breese, Santa Fe, N. Men, assignorto Oil Devices, Santa Fe, N. Mex.,

nership of Illinois a limited part Application July 11, 1941, Serial No.401,919

3 Claims.

My invention relates to, an improvement; in burners and is particularlyapplicable to pot type burners burning liquid hydrocarbon fuels.

One purpose is to provide improved means for supplying secondary airthereto.

Another purpose is to provide an improved burner and radiating orcombustion chamber in which secondary air is supplied to the interior ofthe combustion chamber.

Another purpose is to provide means for supplying secondary air throughthe combustion chamber wall.

Another purpose is to provide means for supplying secondary air to causea swirling or turbulence of the flame.

Other purposes will appear from time to time in the course of thespecification.

I illustrate my invention more or less diagrammatically in theaccompanying drawing wherein:

Fig. l is a vertical axial section;

Fig. 2' is a section on the line 22 of Fig. 1;

Fig. 3 is a vertical axial section of a variant form of the device; and

Fig. 4 is a section on the line 4-4 of Fig. 3.

Like parts are indicated by like symbols throughout the specificationand drawing.

Referring to the form of Figs. 1 and. 2, I indicates a base member orshell, which may be upwardly extended, as at 2, to form an uppercombustion chamber or radiating drum, which may have any suitable flueconnections not herein shown. 3 are any suitable supporting means, legsor the like. 4 is a bottom for the member I, which is provided with apreferably central air inlet aperture 5. 6 is a flange or ring inwardlyextending from an upper portion of the member I.

Mounted on the ring is a pot I, having a concave bottom 8 and a liquidfuel line 9, controlled by any suitable valve, generally indicated asIll.

It will be realized that any suitable means may be employed forcontrolling or varying the supply of fuel along said line. I illustratea conventional manually operable valve, -but.it will be understood thatany other suitable means, automatically or manually controlled, may beemployed. v I

The wall of the pot I is provided with a plurality of primary air inletapertures II, located at various levels therein. The top of the pot ispartially closed by a flame ring I2, having a central aperture I3. Theapertures II are so sized, spaced and proportioned as to provide anadequate supply of primary air for maximum combustion conditions in thepot.

The secondary air I prefer to supply through the wall of the combustionchamber 2. 'I illustrate for example in Figs. 1 and 2, a pair of aleinlet passages I4, I5, which are aligned with apertures I6, I I in thewall of the member 2. Preferably, the members I4 and I5 terminateoutside of but close to the outer edge of the aperture I3. A singlemember I4 or l5 may be employed, but I preferto employ a pair ofdiametrically opposed members, as shown in Figs. 1 and 2. These membersmay be directly radial, but I find it advantageous under somecircumstances to tilt them from the radial, as shown in Fig. 2, in orderto provide a swirl or vortex of secondary air, which tends to surroundthe upwardly traveling mixture of primary air and vaporized hydrocarbonwhich issues through the aperture I3. It will be understood that theliquid fuel supplied along the line 9 to the bottom 8 of the pot isvaporized by the heat of combustion in or above the pot, and thisvaporized hydrocarbon mixes with the primary air to produce a mixturewhich is completely burned upon the addition of the secondary air. Inthe low stages, that is, the pilot stage, the lowest air holes may servethe primary air admission function, and the upper air holes may serve asa secondary air supply when combustion takes place in the lower orintermediate part of the pot. However, at the high fire the additionalsupply of secondary air provided by the inlets I4 and I5 is necessary,and the mixture is completed, and the combustion takes place above thefire ring I2. It will be understood that the height of the fire iscontrolled simply by controlling the rate of supply of liquid fuel, andthe process of combustion is the socalled hydroxylation process, thedetails of which need not here be considered. I do not wish to belimited to the employment of any specific number of the inlets I4, I5,but the structure shown in Figs. 1 and 2 is practical and operative.

Referring to the form of Figs. 3 and 4, they differ from the form ofFigs. 1 and 2 only in the employment, instead of the open ended inletpipes I4, I5, of a distributing head 20, which is preferably located onthe vertical axis of the pot. This head 20 may receive its supply ofsecondary air, for example, through the pipe 2|, which is shown asextending from side to side of the drum 2 connecting the apertures 22and 23 in its side. The passage 2| is connected by a short downward neck24, with the head 20, and the head is provided with air apertures 25,which serve to direct the supply of secondary air, in this instancedownwardly and outwardly, into the mixture of a primary air andvaporized hydrocarbon which rises about the more or less conicdistributing head 20. It is under some circumstances advantageous tohave the secondary air preliminarily heated prior to its admission tothe mixture. and this result is obtained by the employment of the pipe2|, which is subjected to the heat of combustion.

It will be realized that, whereas I have described and illustrated apractical and operative device, nevertheless many changes may be made inthe size, shape, number and disposition oi parts without departing fromthe spirit of my invention. I therefore wish my description and drawingto be taken as in a broad sense illustrative or diagrammatic, ratherthan as limiting ,me to my precise showing.

The use and operation oi my invention are as follows: A

I illustrate-e, so-called hydroxylation. burner, in which a primarymixture of air and vaporized liquid hydrocarbon is formed, and then hasadded to it a supply of secondary air to complete combustion. It hasbeen customary in pot type burners to add secondary air by means ofinlet passages or apertures in the wall of the pot itself.

I find it desirable to employ a pot type burner in which a combustion orradiation chamber is associated which is above and in communication withthe interior of the pot and through the walls of which the secondary airmay be admitted. In the particular form shown in Figs. 1 and 2 I flnd itdesirable to incline the inlet tubes i6, i from the radial in order tocausethe flame to spiral.

It will be understood thatit is practical also to have the tubesdirectly opposed and at any desired angle. Also, the number of tubes maybe varied. The velocity and direction of the secondary air are of primeimportance in the flame formation and placing, and the spiraling. effectobtained by the form of Figs. 1 and 2 is advantageous. I obtain adifferent but also highly practical flame control in the form of Figs. 3and 4, in which the primary mixture flows upwardly and outwardly aboutthe cone 2d and receives the downwardly 1 and outwardly directedsecondary air through the outlets 25.

Referring to theiorm oi Figures 1 and 2, it will be observed that theaxes of the ducts i4 and ii are for convenience generally parallel. Bothaxes are ofiset from a radial line extending from the center of the potto the center of the outlet aperture IE or ii. For convenience I havedescribed this relationship in the claims as inclination from the radialmeaning inclination oi the ducts H or IS in relation to a line extendingradially from the center of the pot to the center or the outlet aperturein the shell 2 with, which the duct I or I 5 is in communication.

Iclaim:

i. In a pot type heater. an outer housing, a

assume humor pot located in a lower portion oi said housing, a closureextending from an upper portion of the pot to the housing, the nothaving a plurality of primary air inlet apertures locatedat variouslevels in its wall, a centrally apertured flame ring partially closingthe top of the pot, a closed bottom for the pot and means for deliverin:a liquid fuel to the interior of the pot, and means ior deliveringsecondary air to the mixture or primary air and vaporized fuel risingfrom the pot which includes a plurality oi tubes inwardly extending fromthe wall of the outer housing and terminating at a level above the topoi the pot and adjacent the aperture in said flame ring, the interior ofsaid tubes being in communication with outside air, said tubes beingprovided with an air delivery aperture located adjacent the aperture insaid flame ring the axis of each said tube extending toward the pot,.but being inclined in relation to a radius extending from the center oithe pot to the inlet end of such tube.

2. In a pot type heater, an outer housing, a burner pot located in alower portion of said housing, a closure extending from an upper portionof the pot to the housing, the not having a plurality of primary airinlet apertures located at various levels in its wall, a centrallyapertured flame ring partially closing the top of the pot. a closedbottom for the pot and means for delivering a liquid iuel to theinterior oi the pot, and means for delivering secondary air to themixture of primary air and vaporized fuel rising from the pot whichincludes a tube inwardly extending irom the wall oi'the outer housingand terminating'at a level above the top of the pot, the interior ofsaid tube being in communication with outside air, said tube beingprovided with an air delivery aperture located adjacent the aperture insaid flame ring the axis of said tube being inclined in relation to aradius extending from the center of the pot to the inlet end of thetube.

3. In a pot type heater, an outer housing, a

- burner pot located in the lower portion of said outer housing, aclosure extending from an upper portion of the pot to the housing, thepot having a plurality of primary air inlet apertures located at variouslevels in its wall, a centrally apertured flame ring, which partiallycloses the top of the pot, a closed bottom for the pot, means fordelivering a liquid fuel to the interior of the pot, and means fordelivering secondary air to the mixture of primary air and vaporizedfuel rising from the pot, which includes a pair or air dc.- livery tubesextending inwardly from the side of the outer housing and terminatingabove the flame ring and adjacent its central aperture, the axes of saidtubes being generally parallel, and being o flset from each other, theaxis of each tube being inclined to a radius extending from the cen terof the pot to the inlet end of the tube.

JAMES L. BREESE.

